66994211 has 2 divisors, whose sum is σ = 66994212. Its totient is φ = 66994210.

The previous prime is 66994201. The next prime is 66994219. The reversal of 66994211 is 11249966.

66994211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66994211 - 2¹⁰ = 66993187 is a prime.

It is not a weakly prime, because it can be changed into another prime (66994219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33497105 + 33497106.

It is an arithmetic number, because the mean of its divisors is an integer number (33497106).

Almost surely, 2^66994211 is an apocalyptic number.

66994211 is a deficient number, since it is larger than the sum of its proper divisors (1).

66994211 is an equidigital number, since it uses as much as digits as its factorization.

66994211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 66994211 is about 8184.9991447770. Note that the first 3 decimals coincide. The cubic root of 66994211 is about 406.1431120450.

The spelling of 66994211 in words is "sixty-six million, nine hundred ninety-four thousand, two hundred eleven".